package com.itcast.mallapplet.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.itcast.admin.dto.UserDTO;
import com.itcast.admin.entity.User;
import com.itcast.applet.dto.UserLoginDTO;
import com.itcast.applet.entity.Shopping;
import com.itcast.constant.MessageConstant;
import com.itcast.context.BaseContext;
import com.itcast.exception.LoginFailedException;
import com.itcast.mallapplet.mapper.ShoppingMapper;
import com.itcast.mallapplet.mapper.UserMapper;
import com.itcast.mallapplet.service.UserService;
import com.itcast.properties.WeChatProperties;
import com.itcast.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private ShoppingMapper shoppingMapper;


    //微信登录
    @Transactional
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获取当前微信用户的openid
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户
        User user = userMapper.getUserById(openid);

        //如果是新用户，自动完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);

            //构建用户的唯一购物车
            Shopping shopping = Shopping.builder()
                    .userId(user.getId())
                    .price(0.0)
                    .number(0)
                    .build();

            shoppingMapper.insertShop(shopping);
        }

        //返回这个用户对象
        return user;
    }

    //查询全部用户信息
    public List<User> userQueryAll() {
        List<User> userList = userMapper.userQueryAll();
        return userList;
    }

    //修改用户
    public void amendUser(UserDTO userDTO) {
        userMapper.amendUser(userDTO);
    }

    //查找当前用户信息
    public User userQuery() {
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getByUserId(userId);
        return user;
    }


    //调用微信接口服务，获取微信用户的openid
    private String getOpenid(String code) {
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
